| Title | Tailoring the expansion of alumina-magnesia cement-bonded castables by BaTiO3 addition |
| Thematic area | Monolithics for Various Applications |
| Presenter | Dr. Wenjie Yuan |
| Authors | Prof. Wenjie Yuan, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Mr. Hai Tang, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Mr. Qingyou Zhu, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Prof. Chengji Deng, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Prof. Hongxi Zhu, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China |
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Abstract
Due to the in situ spinel and calcium hexaluminate formation, alumina-magnesia cement-bonded castables present excellent properties such as slag and thermal shock resistance. However, the expansion derived from in situ reactions is a key issue for keeping the integrity of castables. Normally, mineralizing compounds were used to control the overall expansion as well as the phase and microstructure evolution of castables. In this work, the influence of BaTiO3 addition on the expansion of alumina-magnesia cement-bonded castables was investigated by combining of the effects of BaO and TiO2. The phase composition and microstructure of castables with BaTiO3 addition after calcining at 1150-1450 ºC were characterized by X-ray diffraction and scanning electron microscope. By comparison with the reference, lower expansion and higher strength for castables with addition of 1wt% BaTiO3 calcined at 1450 ºC were achieved. The results show that element Ba and Ti played a role in enhancing the bonding and increasing the expansion respectively. |
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